Unable To Open Connection To Com1 Putty Windows 11. On the laptop, I can ping the remote address, and can do a tracert
On the laptop, I can ping the remote address, and can do a tracert to the remote address, and also I can use OpenSSH from the command line ( ssh Feb 6, 2024 · After connecting the device to my laptop it also shows up in the device manager but it seems that I'm unable to open the COM port for communication (I'm using LabVIEW but also tried using PuTTY). Jan 17, 2022 · We can create custom launchers to open certain applications, or perform actions. Add COM Ports manually. Feb 1, 2021 · I'm having trouble using putty to set up a serial connection using my 16 port GSM modem. Also, if from the CMD line I run: change port /query I see the following: AUX = \DosDevices\COM1 COM1 = \Device\RdpDrPort;COM1:179\tsclient\COM1 Sep 3, 2014 · In the PuTTY logs, this comes up after I try to run an x program (after SSH login). May 30, 2015 · Unable to open connection on myhost: Host does not exist My firewall is off and I have even re-installed putty but that did not fix it. \COM1": The system cannot find the file specified". I also tried using PuTTY to communicate, but it also didn't work. See full list on windowsreport. Windows Nov 7, 2014 · But I can’t start another debug session because I get the same “Unable to open connection to COM3 Unable to open serial port”. But, the VM I'm connecting to doesn't have a password? Her I was trying to communicate with a hauwei switch in console port and used rj45 and rs232. Specify the destination you want to connect to: Serial Line: use the COM # (e. Can’t do many debug runs if you have to reboot the main computer each time. It can be used to create a Secure Shell (SSH) between 2 devices, open a Terminal Over A Network (telnet) connection, and offer a few other options as well. I checked and installed the most recent drivers through the device manager and also installed them manually to be sure. 67 Problem I am trying to use plink to open a serial port connection on COM9. Observing an error similar to the following when attempting connection using PuTTY on a Windows client: Unable to open connection to COM8 Configuring serial port: Error 31: A device attached to the system is not functioning. Edit the settings, eg: COM1, 9600, 8, 1, None. On the Serial line connect to section enter the name of the port that you can see on the Device manager Windows and other basic settings baud rate, data bits, stop bits according to your device specifications. 2014-09-01 15:16:38 Received X11 connect request from 127. Apr 26, 2018 · Given that the ssh is disabled and that I'm using a Windows 8 machine with putty installed, I would like to know the easiest way to enable ssh and connect to my Raspberry Pi Zero W with installed Rapspbian Stretch (2018 edition). Just for reference I connected my GSM Oct 20, 2021 · Using PUTTY windows, the problem is the same, it does not work when trying to open the real port, and the error code is 87. However I am able to use Putty, with same settings to access a Cisco 2500 series router. 1 on it, and I have connected it to the Pi using an Ethernet cable. Jun 6, 2024 · 文章浏览阅读4k次，点赞9次，收藏11次。以上是我碰到的“报错Unable to open connection to :Unable to open serial port”问题的解决办法，记录一下。1、连接开发板，若用Windows排查，打开设备管理器，可以看到，我这里的CH340驱动正常显示，若端口无法正常显示驱动，考虑重新安装。可以看到我这里的端口号是 I am trying to use putty and XMing to run programs from my Fedora 20. Select the “ Serial ” radio button under “Connection type”. Dec 4, 2024 · Are you getting the "Network Error: Connection timed out" error when using PuTTY? If you are, you come to the right place. When I run putty I enter serial option change com1 to com5, change baudrate to 115200. Flow control: None. Supported OS: Windows 2000/ME/98SE, Windows XP (32/64-bit), Windows Vista (32/64-bit), Windows 7 (32/64-bit), Windows 8/8. The drivers that Windows installs automatically don’t usually work. Device compatibility issues: After the release of Windows 11, you may encounter some cases where older devices are incompatible. We also publish the latest PuTTY installers for all Windows architectures as a free-of-charge download at the Microsoft Store; they usually take a few days to appear there after we release them. Mar 23, 2011 · I have an external device (running a small Linux-based OS) that I need to log in to via the Windows 7 command line. spiceuser-vnmtw (ZeroXrd) January 2, 2024, 1:24pm 4 netcacique: Try this article: Unable to Open Connection to Com1: 8 Ways to Fix Feb 8, 2025 · Windows 11 updated to latest Putty updated to latest Teraterm installed and the same exact problem Two different sets of previously good serial cables tried Drivers updated cor serial devices and said to be current Different USB ports on laptop tried,… In Windows 2003 when i run plink without arguments, it says "unable to open connection: host does not exist" (And of course when it is run with arguments) What can be the cause? Jun 6, 2024 · 文章浏览阅读4k次，点赞9次，收藏11次。以上是我碰到的“报错Unable to open connection to :Unable to open serial port”问题的解决办法，记录一下。1、连接开发板，若用Windows排查，打开设备管理器，可以看到，我这里的CH340驱动正常显示，若端口无法正常显示驱动，考虑重新安装。可以看到我这里的端口号是 Jun 5, 2015 · I have a laptop with Windows 8. This post shows how to fix it. Use Device Manager to determine which port the computer has assigned the USB-to-Serial cable to. XX:10. Jan 15, 2023 · 01-15-2023 02:17 PM - edited 01-15-2023 02:17 PM @MicJameson1 wrote: "Unable to open connection to COM1 Opening '\\. Oct 16, 2014 · 13 A PuTTY session left idle will disconnect at a time determined by the host server. I am trying to run putty on Windows 7. I want to SSH in to the Pi, so I have installed PuTTY. Jul 31, 2025 · Learn how to check, enable, and fix missing COM ports in Device Manager. Nov 28, 2022 · 2 I am using windows 7, 64bit I have a MKS gen l connected to a usb port The CH340 com port emulation driver converts USB in to a virtual com port, com 5, baudrate 115200. I am simply trying to access a cisco router using the recommended PUTTY. Simply, we use Remote Desktop Connection (RDP) for connecting to a remote Windows machine, the same way, if we want to connect to a Linux server from Windows machine, we use PuTTY. Jun 7, 2019 · port. When i press connect nothing appeared in screen except black terminal. “COM3”) noted in Identify the serial COM port Speed Jul 31, 2017 · I use Putty all the time on Windows 10 with Cisco Devices, however my adapter uses an FTDI chipset. The install CD will have the right drivers. Go straight to the download page for the latest version, or to the main website. My host has Windows 7. Tried a whole lot of things from re-generating . Step 1: Launch PuTTY In the PuTTY configuration window on left panel, go to Connection>Serial. On Windows, the first serial line is called COM1, and if there is a second it is called COM2, and so on. I have seen putty lock up if the serial port misreads the connection, usually closing putty and re-seating the connections works. XXX. Apr 28, 2025 · I can use windows provided openssh via powershell or putty either without elevating or as administrator. Dec 28, 2023 · That usually happens to me when I haven’t properly installed the USB-Serial drivers. " Try different COM ports. I checked in all possible places like port selection, board selection, port driver, using a data cable and all other possible options. Sep 14, 2021 · While attempting to connect via serial connection using PuTTY an error similar to the following is seen: Unable to open connection to COM1 Opening '\\. This causes PuTTY to send null SSH packets to the remote host periodically, preventing the session from timing out. Same settings as USB port emulator. I want to run startx via PuTTY and Xming. The reason why we need to see information via COM1 in PUTTY windows is that we need to see the port COM1 in the Python program we use in our system. Putty was still expecting an SSH connection and dinging because no IP address was given. We'll cover everything from checking your settings to reinstalling the drivers. These launchers work across all connected devices and are useful for common applications such as PuTTY. But, it produces this error: PuTTY X11 proxy: unable to connect to forwarded X server: Network error: Connection refu Instead, Cygwin's X uses (the Cygwin implementation of) Unix domain sockets, and PuTTY (as a native Windows program) doesn't know how to use these. 39 I was able to get PuTTY installed by getting the App from the May 8, 2015 · I was logging in via a windows machine into a Ubuntu 16 server via putty (with x11 forwarding enabled). PuTTY is an SSH and telnet client, developed originally by Simon Tatham for the Windows platform. I used this configuration before on other machines and I was able to run GUI programs on Linux and display them in my windows 7 PuTTY landing page PuTTY is a free software SSH client for Windows and also Unix, including an xterm -style terminal emulator. The device is connected to COM1 with a USB-to-serial cable. I need to connect to the VM and redirect the X11 output of the commands to my host. May 27, 2022 · The next time you run putty. \COM1': Error2: The system cannot find the file specified. The Cygwin X FAQ and Cygwin mailing lists have more details. ) to see if a successful connection can be established. Apr 27, 2023 · A Windows 11 / 10 computer has a built-in SSH client and a server – meaning it can be used to connect to a remote PC using SSH, and it can be connected to as well. This is not a big problem, and you can solve it by disabling these services. Sep 27, 2020 · cmd mode gives only COM1 (internal to motherboard) putty gives "Unable to open connection to COM2. 20 hours ago · The Windows 11 KB5074109 security update released on January 13, 2026, introduced an issue where users could only restart their computer after attempting to shut down or put it to sleep. 0. 67 plink 0. 0 I did set below setting in /etc/ssh/sshd_config Mar 15, 2017 · I have a VM with RHEL 5 without an X server. 79 on MS Windows 10 Pro. Use to be easy with XP. Mar 11, 2022 · I'm attempting to connect to a Cisco 4010 network switch via it's built in usb port (which internally is a usb to rs232 adapter wired to the back of the console port). NET in C#. Xauthority files to adding magic cookie in using xauth list. On this server, I run a webshop which backups should stall on an other server (lets call it Server 2). Open(); // System. This will help determine if the issue is specific to PuTTY. 6 and Above, Linux 2. In the meantime I installed putty on another Windows 11 computer and that worked just fine with my existing cables. exe launcher, so it just runs putty. com Feb 8, 2025 · If the problem occurred after a recent Windows update, you can consider rolling back to the previous version before the update. In order to use X11 forwarding, an X11 server needs to be installed on the client (in my case Windows here). Try enabling keep-alives in PuTTY. The parameters are correct; COM1 has been verified through Device manager. . We provide multiple methods, including manual fixes, modifying BIOS settings, updating drivers, and creating virtual ports. 1:49900 I have an identical setup on my laptop (W10 Enterprise v1809) and it works fine, with both the PuTTY and Workbench configs exported from my laptop. Jul 15, 2023 · Download and install the drivers for Windows 11, and then restart your computer to see if the device was successfully identified. So you can get back to using Putty in no time. In Windows 2003 when i run plink without arguments, it says "unable to open connection: host does not exist" (And of course when it is run with arguments) What can be the cause? Aug 30, 2023 · 1 When I am using MOBAXTERM to connect to Orange PI 4 LTS through serial port, a prompt appears: Unable to open connection to COM3 Opening '\. Feb 1, 2021 · 0 windows and linux have different ways of handling usb devices, assuming it is looking for a com port, you'd need to open up device manager and look for 'Ports'- see image, I have an arduino plugged in, and it's on COM3, therefore in order to open it with pyserial I would use the following: Nov 9, 2023 · Hello I encounter some problems under Windows 11 23H2 to access a simple Serial Port under . \COM3 ': Error 5: access denied System: Windows 11 x64 I tried to run as an administrator, but it didn't work. Feb 16, 2021 · why do i get error 5 when trying to connect to com port 1 and please i am a novice so i need you to answer in terms i can understand i am 76 years old many thanks Serial connection with putty on Windows OS If you are trying to connect with a USB-to-DB9F cable (null-modem / serial cable) on Windows using putty, you are in the right place. The following screenshot shows my configuration for the serial port and the settings in PuTTY. XX. It is going from a USB port of my computer to the Console port of the 3825. The virtual ports can be open witout problems. Apr 6, 2023 · Hi Everyone, I need help getting PuTTY working on Windows 11 Pro using WampServer. In PuTTY, double-check that you are in the “Session” screen. Mar 17, 2024 · In this post I want to show how you can enable X11 forwarding by using PuTTY and the Xming X Server for Windows. Jun 16, 2009 · I have downloaded the USB gear drivers. Easy to setup: Plug & Play - Simply plug your device into the adapter and the adapter into your PC or Jun 1, 2019 · OK, this one is rather stupid: I forgot to select the "Serial" radio-button on the Session tab and went straight to the Serial tab. I'm on a Windows 7 machine and have installed PuTTY. I have to reboot the Win 7 machine to start another debug session which certainly takes forever. I'm trying to connect, but the authentication fails because of an incorrect password. On server 1 I have nearly zero rights to run anything besides scp and ssh and basic shell commands. Dec 26, 2024 · Hello, This may be a novice question, but I'm trying to install OpenWrt on a set of AP3825i access points. Using PuTTY I can open the serial connection on COM9 and I have a saved s The ‘Serial line to connect to’ box allows you to choose which serial line you want PuTTY to talk to, if your computer has more than one serial port. Nov 24, 2023 · Hello people of this community, I purchase a vpn and when tried to connect through ssh i got the error " connection timed out " every time I try to connect using putty. I've tried the native WIn10 USB com drivers, the HPE specific drivers. PuTTY is open source software that is available with source code and is developed and supported by a group of volunteers. Vista tells me it is unable to open com1? Any ideas? Jan 9, 2025 · Description Unable to console to BIG-IP device. Jun 5, 2015 · I have a laptop with Windows 8. 22H2. I am using the correct baud rate, data bits and stop bits for my modem. Unable to open serial port" The intended use software simply gives nothing. Unable to open serial port - putty So yeah. How do I do this with Feb 16, 2024 · I am trying to run firefox on a remote server over ssh and use X11 forwarding to open the window on my laptop, but when I try to it throws the "PuTTY X11 proxy: No authorisation provided" Feb 1, 2016 · Meilleure réponse: Salut, essaie de voir dans le gestionnaire de périphériques quel port com est actif, ce n'est pas forcément com1 Jun 19, 2024 · If you’re trying to connect to a different port that isn’t open or configured for SSH, you’ll get a connection refused error. IOException: 'The parameter is incorrect. Suggested read: 3 Ways to Fix Too many Authentication Failures SSH Root? 2 Open PuTTY, and click Serial from the Category: Connection. 1 (32/64-bit), Windows 10 and higher (32/64-bit), Mac OS X 10. I can ssh into a unix system/browse the unix systems cockpit (management web UI) and login fine but in about one minute my ssh session hangs and dies or the webui says session disconnects. It can also communicate over a serial port, or speak various legacy Internet protocols such as Telnet. exe process), the Registry value will be recreated. This problem often occurs due to missing permissions, incorrect port configurations, or driver issues. Oct 1, 2021 · PuTTY X11 proxy: unable to connect to forwarded X server: Network error: Connection refused Error: Can't open display: XX. Dec 3, 2015 · I followed the 'Getting Started' tutorial and got to the use putty to open a serial communication part and when I click 'Open' it just makes the windows error sound and does nothing. That way I fixed the issue with starting putty 0. Jan 26, 2023 · Fix PuTTy Fatal Error, Network error, Software caused connection abort or Connection timed out or was refused on Windows 11/10. Kindly advise suitably. I have a VPS which OS is CentOS6. PuTTY is a communications tool for running interactive command-line sessions on other computers, usually via the SSH protocol. \COM1': Error 2: The system cannot find the file specified. I use this USB adapter that has status indicator lights that helps allot with mysterious serial connection failures. exe directly in local mode when you pin an app via Windows. 3. 1:59566 2014-09-01 15:16:38 Opening X11 forward connection succeeded 2014-09-01 15:16:38 Nothing left to send, closing channel 2014-09-01 15:16:38 Forwarded X11 connection terminated – wkdmarty Feb 8, 2025 · Windows 11 updated to latest Putty updated to latest Teraterm installed and the same exact problem Two different sets of previously good serial cables tried Drivers updated cor serial devices and said to be current Different USB ports on laptop tried,… Jun 9, 2025 · Fix the Missing COM port issue on Windows with these 3 fixes - 1. Try using other serial communication software (such as SecureCRT, MobaXterm, etc. i pluged the rs232 on my computer and tried connecting to device with putty and hyperterminal. I use my Windows PC which connects to a remote server over ssh (let's call it Server 1) with PuTTy. Aug 14, 2025 · PuTTY is a free implementation of SSH and Telnet for Windows and Unix platforms, along with an xterm terminal emulator. Jan 16, 2025 · Now that Windows 11 no longer has a LPT/COM section in the Device Manager, how do I find out what devices are attached to COM ports (via USB)? Dec 12, 2016 · Configuration: Windows 7 putty 0. I pressed enter multiple times but still nothing appeared i used Communication Port Com 1 Jan 18, 2022 · My new Lenovo laptop with Windows11 home will not connect to a remote address using PuTTY. It is written and maintained primarily by Simon Tatham. A serial console provides direct, out-of-band access to a device for initial configuration, troubleshooting, and recovery when network access is unavailable. g. I'm using the following: -Windows 7 Professional computer that has a serial port -Putty software -serial to rj-45 cable -Cisco Catalyst 2900 series XL switch My Putty settings are the following: serial line com3 speed 9600 da Jun 1, 2019 · OK, this one is rather stupid: I forgot to select the "Serial" radio-button on the Session tab and went straight to the Serial tab. including installation, terminal window, configuring, generating SSH keys. exe from Windows Start Menu or Windows Explorer (which both work from explorer. 3 Select Category: Session, click the Serial radio button, 4 If you want to save this session, enter a name in Saved Sessions and click Save. IO. Using putty generates: " unable to open connection to com1 Unable to open serial port". Feb 8, 2024 · After connecting the device to my laptop it also shows up in the device manager but it seems that I'm unable to open the COM port for communication. Every time putty gives me this fatal error: network error: connection refused I have even tried to us Jan 23, 2024 · This shortcut connects to a Windows Server 2012 server and passes the COM data just fine. My main PC on the same home network works fine. Dec 17, 2019 · 31 I want to connect with my serial Port using the PuTTY program, but it's not possible: When I click “open” nothing happens, I only hear a “Beep, Beep …” under a Windows 7 or MAC OS X with VirtualBox. Jan 14, 2019 · Putty cannot open Windows 10 serial port – Sometimes this problem can occur due to some Windows services. The error is "can't open device "\. So I'm trying to setup the mgmt modules on a new MSA 2050 and no matter what I do I am unable to connect to the cli. Connecting with PuTTY on Windows 11 makes it possible to interact with the device’s console port using a familiar GUI. on a remote desktop I can. The is the guide to Install PuTTY with all the detailed installation instructions for Windows 10, 8, or 7 Jan 11, 2025 · If PuTTY shows the error "Unable to open serial port" on Linux Mint, it means there’s a communication issue between PuTTY and the serial port device. I need to run some SSH commands to upgrade Magento. Then I click open. I searched regarding this on Internet but did not find much relevant. Enable Show Hidden Drivers, 2. Here is how to use PuTTY on Windows. This will ensure that you have quick access to your commonly used sessions. Make sure your USB device is compatible with Windows 11. Oct 9, 2019 · Appears you don't have COM1 if Putty cannot open it, or another program is using COM1. Jan 9, 2011 · Greetings, I'm trying to connect via serial to rj-45 to a Cisco Switch. I'm following the instructions on the install page (I think) but I cannot seem to get PuTTY to connect Jan 2, 2014 · I am unable to use console cable+Putty, nor Terra Term, Win 7 to access the 5505. When you open PuTTY, the configuration window is shown: Is there any way, to directly open its terminal, without that welcome (configuration) window? Where I can start typing the codes directly, l Dec 26, 2015 · Windows doesn't understand apps that require multiple EXEs to run like with our PuTTYPortable. May 13, 2025 · Unable to Open Connection to COM1: 7 Ways to Fix The world of computers and technology is characterized by its complexities and nuances, especially when you’re interfacing with hardware through serial ports. We have been told that if PUTTY windows does not see the UART port, Python (pyserial) neither. Access to the serial interface com1 cannot be opened – This problem may occur due to problems with the serial interface. On the server I can connect to COM1 using Putty and see data. A cat5e cable is going from LAN2 to the router. ' same message writes me program Realterm, PuTTY do nothing and "Tera Term" program works correct - I can send and receive data to my MCU program. 4 or above. My earlier installations with Windows 10 and Jan 11, 2018 · Host key verification failed. May 18, 2020 · In Workbench, I try to connect to localhost on port 49900 after establishing the SSH connection through PuTTY, but it fails to connect: Unable to connect to 127. The PuTTY client can be configured to always establish a connection which will not time out due to inactivity. While not directly related to TNG, it is related to getting the TNG Wiki MediaWiki software upgraded to the next Long Term Support (LTS) release MW 1. May 13, 2025 · Provides the connection between USB and the traditional RS-232 serial port. I have a USB to console cord, cheap one with a ch340 chip. “COM3”) noted in Identify the serial COM port Speed: use “115200” for the baud rate Serial Line: use the COM # (e. Using PuTTY for serial connection Ask Question Asked 15 years, 6 months ago Modified 3 years, 11 months ago Oct 7, 2022 · After updating to Windows 11 I can no longer get the serial port in Ports COM & LPT from the Device Manager. I am at a loss for what to do. Update COM Port drivers, 3. I went to the Windows command line and typed in ipconfig and looked under Ethernet adapter Ethernet > Autoconfiguration IPv4 address to find the ip address of the Pi. I've resorted to posting this question online as it should be something so simple. Unable to open connection to COM1 Putty? Learn how to troubleshoot this common problem with our step-by-step guide. I know that if my host were a GNU/Linux mac Feb 9, 2024 · When I open the device manager I can see that the device is connected to my laptop but I can't open the COM port to communicate with the device (I tried using LabVIEW and PuTTY). When I select Device Manager nothing shows up, I cannot see Ports COM & LPT. I am running putty on Windows 7. Mar 13, 2023 · But don't know how to find a solution. message. When I tried connecting to the same server using putty on some other windows system, I was able to do so. I have now tried different serial cables and different adapters, updated putty, reinstalled putty, running as an admin, turning off firewall, and the only thing that works is using a different computer. Jan 25, 2020 · It supports Telnet, SSH, and Serial ports, so that we can connect either by taking a remote session or directly through a serial cable.